<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
    </head>
    <style>
        p::after{
            content: "";
            border-top:1px solid black ;
            height: 5px;
            width: 5px;
            transform: rotate(-60px);
        }
    </style>
    <body>
        <p>123</p>
    </body>
</html>